reinstalled Windows with rx480, switch to calculate in radeon drivers, add arguments to claymore specified -strap 1 -rxboost 1 in Nicehash miner ---- everything is as it was before, but claymore did not accept these arguments and gives 24 mx.
Can you tell me what the problem is?
I had this issue before. Basically if your clock rates are properly set (memory clock at least 2000mhz) then your issue is that most likely you need to manually mod your bios. For me it was hit or miss with the "-strap 1" command, on some rigs it worked while on others I couldnt get it to work, got a low hashrate and just manually modded the straps with the bios.
Try that and then run it with and without the strap command, if you are still getting the slow speed then download a different version of AMD drivers, sometimes the latest ones can be buggy. And make sure your core clock is at least 1100mhz or so. Make sure its not stuck at 700mhz or so.